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My curiousity had been raised by the number of glyphs in the Tahua tablet:

Tahua (A)

Keiti (E)

Large Santiago (H)

side a

670

 200π+42

side a

326

100π+12

side a

*648

200π+20

side b

664

 200π+36

side b

302

100π-12

side b

*648

200π+20

sum

1334

400π+78

sum

628

200π

sum

*1296

400π+40

 
Zero was once not necessary to write down. It could be understood anyhow that for example 36 probably meant 36 decades = 360 (i.e. the number of days in a rationally defined calendar for the year, with 5¼ days left out for practical or other reasons).
 
I concluded that 42 (redmarked above) meant 420, but what period was that?